Insulator cap



Patented June 29, 1926.

UNITED STATES PATENT OFFICE.

BENJAMIN W. KEER, OF GREENSBURG, PENNSYLVANIA, ASSIGNOR TO RAILWAY AND INDUSTRIAL ENGINEERING COMPANY, F GREEN SBURG, PENNSYLVANIA, A COB- PORATION OF PENNSYLVANIA.

IN SULATOR CAP.

Application led Iarch 1 3, 1922. Serial No. 543,895.

This invention relates to electric insulators and more particularly to means for attaching or securing a structure tov be insulated by the insulator.

It is the more special object of the invention to provide an insulator with means for facilitating the attachment thereto of a structure to be supported thereby.

For a full understanding reference is made to the accompanying drawings inlwhich Fig. 1 is a side elevation of an insulator embodying the invention;

Fig. 2 is a plan view of the principal part of the invention:

Fig. 3 is a section on line 3-3 Fig. 2; and

Fig, 4 is a fragmentary view in side elevation of a part shown in Fig. 2.

In Fig. 1, 10 represents an insulator having a forged steel pin 11, a plurality of petticoats 12, the upper one of which has a top portion 13 provided With the usual groove 14 for carrying a conductor.

The insulator thus described may be of any standard or preferred type.

According to the invention a cap 15 formed of pressed steel is attached to the top portion 13 by means of cement. This cap 15 is formed as a shell having at its bottom an inturned flange 16 adapted to prevent outward movement of the cap When the cement has set. The upper petticoat has, as is usual, a circumferential groove 17 defining a circumferential shoulder forming a head 13, which prevents the body of cement from slipping off after hardening.

To apply the cap it is merely necessary to ll the interior thereof with cement, force it down upon the head 13, adjust the relative positions of the insulator and the cap 0 until the latter has assumed its final position and allow the cement to harden.

In practice I prefer to place between the upper surface of the head 13 and the cap 15 a filler or spacer 19.

The purpose of the cap is to provide means for attaching a structure to the insulator. While the cap may assume various forms Within the scope of its purpose I have found that the form illustrated is particularly advantageous both in point of simplicity of manufacture and in point of openation. Y

As best shown in Fig. 2, the cap may have a plurality, for instance four depressions 20 affording space` for the head of a bolt. Above the upper surface of the shell is disposed a plate 21 having a plurality e. g. four radial slots 22 in registration with the depressions 20. While this plate 2l may be secured to the shell in any suitable Way, I prefer to spotweld it, as indicated by the points of Welding contact 23. Y

The parts When permanently connected in this manner forma one-piece cap having a shell-like body, a top Wall having grooves for receiving a bolt head and flanges with bolt-receiving slots in vertical alignment with the grooves or depressions in the Wall.

To attach a structure to the insulator, it is thus merely necessary to place bolts in the depressions 20and the radial slots 22 and into and through bolt holes on the structure to be attached. While I have shown four depressions and radial slots, two or three may be sufficient.

It is understood that various changes may be made in the arrangement shown. While the depressions and the plate 21A are disposed in a plane at right angle to the pin 11, they may be disposed at any desired angle relatively thereto, according to the particular purpose.

I claim 1. A metallic insulator cap comprising a shell adapted to fit over the upper end of an insulator and to receive cement for securing the said shell to the insulator, a Wall closing the top of said shell, the said Wall having a plurality of grooves therein of a width to receive a bolt head and fianges overlying the respective grooves and having bolt-receiving slots opening into the same.

2. A metallic insulator cap comprising a one-piece shell adapted to be cemented to the top of an insulator. a Wall closing the top of said shell, the said Wall having radial grooves therein which exten@ to the peiiphery of seid shell, and Heiliges overlying the respective grooves and having boit-teeeiving slots communicating with the same.,

3. All attachment foi' imsuiotoifs consisting of at `metallic cop having o plurality of depressions lin its outer surface and e Leeoeei tate secu'ei to the cap, having radial slots m registration with the depressions and defining therewith onchoiing points for bolt heads.

1in testimony whereof, it atx my sigmatui'e.

BENJAMIN vv; time. 

